if you just vent the room with the tents inside it will be way less efficient then venting each tent separately
doing this will only create some air movement in the room and some air will be exhausted from the tents .. but very few air
if you really want to vent several tents with a main exhaust you need to make derivation on the main ventilation conduct, to each tent
co2 will make it easier, more economic with better results if well managed
if you use a burner(i advise it, the only realistic way to enrich) it's not dramatic if the room has some cracks/leaks
some smell will espace though, if you grow some bomb it can be a problem
how is the room made ? walls
Thanks for your input yet again man. So it’s a bellow ground opp. Stone/brick walls.. I separated a portion of it so I can start my perpetual endeavors. So two of the 4 walls are 2x4s… i framed in a space to put in a in wall ac/heater to control the flower room year round.. that would also help with the RH of the area.. im sure the smell will be a issue if I grow in the open room without venting secrecy is my top priority